Model Number:DT2234C andThis non-contact tachometer is a and practical motor speed meter to measure the revolutions per minute(RPM) with wide measuring range and high resolution. It's featured with high accuracy measurement, quick measuring time and long detecting distance up to 500mm(20 inch).This tachometer is very easy to use by applying a reflective tape(included 3 in package) on target object, then aim at the mark by beam. This tachometer has wide range of applications, such as measuring rotating speed of machine, motors, wheels, lathe for metal or wood cutting work, electrical fan, paper making, plastic industry, chemical fiber, washing machines, car making etc.No-Contact handheld digital photo tachometer with stable performance.Automatically record the MAX. value, Min. value and Last value with low battery indication.Capable of measuring at a distance from 2-20in(50-500mm) with LCD display.0.8 Second sampling time and 5-digit 18mm 0.7 inch LCD display with non-contact RPM measurement.Measuring Range: 2.5RPM - 99,999RPMResolution: 0.1RPM at 2.5-999.9RPM, 1RPM at 1000-99,999RPMAccuracy: (0.05 percent and1 digit)Time Base: 6MHz Crystal OscillatorTest Range Select: Automatic SwitchingFunction: Display Last Value, MAX. Value, Min. Value Supply: 1 x 9V 6F22 Battery(NOT Included) Consumption: Approx. 30mAWorking Temperature: 0-50(32-122)Product Size: 130 x 70 x 29mm or 5.12 x 2.76 x 1.14inProduct Weight: 79g or 2.80ozNote:1. You must stick the reflective tape onto the target object before measuring.2. Do not point towards eyes directly safety eyewear is recommended.3. Do not use it near explosive gases or in other potentially explosive areas.colour:Black and brownMaterial:plasticPackage Contents:1 x Digital TachometerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.